Opinion Journal: Is Questioning Climate Change Illegal?

This transcript has been automatically generated and may not be 100% accurate.

... this might home and see doctor Mark Stein and others ... they criticized says climate models ... the DC Court of Appeals is hearing the case why should you care ... well Marc Stein is here is the author of Mark Stein un documented ... first the facts for viewers who might not be following this case ... what exactly ... are you being sued for excuse untangling proposition ... the ay ay ay ay ay ay ay described his hockey stick graph has for ... which I believe to be the case of customers forgiven ... in a national newspaper in the United Kingdom on Saturday in national publications in Australia and Canada ... I'm editing stated ... and I've been saying it for fourteen years I said it had ... and the National review and the competitive Enterprise Institute ... and rents and undeniable being sued by dope to man ... for defamation ... and it is now in its side the a ... in the one I that God is the trips to and the ... District of Columbia just smile ... two hundred mm eighty well below ... spot we went really well Mr man on the show that said having cited the story two we will ... extend that invitations and mark ... in the meantime I this case is being construed as of battle between ... by environmentalists and climate change skeptics but it sounds like ... I'm actually a battle of free speech the first Amendment rights ... it is of Hussman about lives have been called to the innocent of any well informed Jace ... and discussing with the lowland of Apple pulling to tweet you switch from treating me crawl sees ... it or actual temperature records ... and the andthe the size of fortnight that is required for when you disclose that ... much already fascinates me but it's essentially an argument ... I bough public policy ... and on time and is known to a pack climate scientists and matches the climate science ... activist who wants to influence ... public policy in the United States he's been seen in campaign commercials ... at the Terry McAuliffe governor's race in Virginia for example ... ISI essentially this is a way all ... of of of putting public policy ... into into the hands of Jarrett's ... at which would be completely disastrous if they stay if you know when this case ... will be the world's setback for the first amendment ... in fifty years would mean that if you disagree with the president style of the government on day manage or immigration ... or ISIS ... ay ay ay ay ay ay could be debated by I'd be litigated by judges and jurors that would be a terrible setback for freedom of expression while I know that there been similar attacks on free speech in Britain and Australia other democracies to ... so we certainly see these attacks all over the world ... Marc Stein thank you so very much for joining us thanks mom ...